NUMERICAL SIMULATION OF ULTRAFINE PARTICLE-LADEN CYLINDER WAKE FLOW WITH COHERENT STRUCTURES
- Resource Type
- Authors
- Hai Ding; Zhilin Sun; Shujie Zhi; Zhanhong Wan; Changbin Wang
- Source
- Modern Physics Letters B. 23:529-532
- Subject
- Physics
Turbulence modeling
Statistical and Nonlinear Physics
Mechanics
Wake
Vorticity
Condensed Matter Physics
Kármán vortex street
Physics::Fluid Dynamics
Momentum
Classical mechanics
Ultrafine particle
Fluid dynamics
Large eddy simulation
- Language
- ISSN
- 1793-6640
0217-9849
The phenomena of the wake flows containing ultrafine particles such as dust and pollutant in the atmosphere are usually observed downwind of the mountains and buildings. Different from the usually heavy particles, the ultrafine particles suspended in fluid undergo the processes of nucleation, growth and coagulation. Coherent structure in typical occurrence of the stretching of the Karman vortex street can be clearly seen in above mentioned gas-particle wakes. The aim of the present study is to explore the effects of coherent structures on the coagulation and growth of ultrafine particles suspended in wake flow. The particle field is represented by employing a moment method to approximate the ultrafine particle general dynamic equation. The fluid flow is obtained by solving the continuity and momentum equations with the large eddy simulation method and the subgrid-scale stresses were parametrized using the dynamic eddy viscosity model. The calculated contours of vorticity were compared with the relevant experimental results. The instantaneous spatial-temporal distribution of the particles are given and analyzed. The effects of the coherent structure on the diffusion and distribution of particle number concentration, polydispersity are discussed in detail.